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采用数值分析方法模拟了带有隔热屏、火焰稳定器和尾喷口的加力燃烧室热态流场 ,并对隔热屏进行屈曲分析 ,计算中采用 k-ε双方程模型描述紊流特性 ,采用 EBU -Arrhenius燃烧模型计算化学反应速率。为了考虑火焰热辐射对气体温度分布的影响 ,用热通量法的辐射模型来估算辐射通量。在热态流场计算基础上 ,数值研究了发动机不同工况和隔热屏不同冷却结构及流量分配对加力室流场和隔热屏以及筒体壁温的影响。此外 ,还利用流场计算提供的气动和热负荷对隔热屏进行屈曲分析 ,根据实际情况 ,对隔热屏受力情况作了简化 ,把带波纹的隔热屏简化为圆柱壳 ,采用有限元方法对其屈曲模态和临界载荷进行了计算 ,取得了较为满意的结果
The numerical simulation method was used to simulate the thermal flow field in the afterburner with a heat shield, a flame stabilizer and a tail nozzle. The buckling analysis of the heat shield was carried out. The k-ε two-equation model was used to describe the turbulent characteristics The chemical reaction rate was calculated using the EBU-Arrhenius combustion model. In order to consider the effect of flame heat radiation on gas temperature distribution, the radiative flux is estimated using the radiation model of the heat flux method. Based on the calculation of the hot flow field, the influence of different cooling conditions and flow distributions on the flow field, the heat shield and the wall temperature of the cylinder was studied numerically. In addition, the aerodynamic and thermal loads provided by the flow field are used to analyze the buckling analysis of the heat shield. According to the actual situation, the stress on the heat shield is simplified, the corrugated heat shield is simplified as the cylindrical shell, Element method to calculate the buckling mode and critical load, and achieved satisfactory results